1 //===- SymbolSize.cpp -----------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/Object/SymbolSize.h"
11 #include "llvm/ADT/STLExtras.h"
12 #include "llvm/Object/ELFObjectFile.h"
15 using namespace object;
26 static int compareAddress(const SymEntry *A, const SymEntry *B) {
27 if (A->Section == B->Section)
28 return A->Address - B->Address;
29 if (A->Section < B->Section)
31 if (A->Section == B->Section)
36 static int compareNumber(const SymEntry *A, const SymEntry *B) {
37 return A->Number - B->Number;
40 ErrorOr<std::vector<std::pair<SymbolRef, uint64_t>>>
41 llvm::object::computeSymbolSizes(const ObjectFile &O) {
42 std::vector<std::pair<SymbolRef, uint64_t>> Ret;
44 if (const auto *E = dyn_cast<ELFObjectFileBase>(&O)) {
45 for (SymbolRef Sym : E->symbols())
46 Ret.push_back({Sym, E->getSymbolSize(Sym)});
50 // Collect sorted symbol addresses. Include dummy addresses for the end
52 std::vector<SymEntry> Addresses;
54 for (symbol_iterator I = O.symbol_begin(), E = O.symbol_end(); I != E; ++I) {
57 if (std::error_code EC = Sym.getAddress(Address))
59 section_iterator SecI = O.section_end();
60 if (std::error_code EC = Sym.getSection(SecI))
62 Addresses.push_back({I, Address, SymNum, *SecI});
65 for (const SectionRef Sec : O.sections()) {
66 uint64_t Address = Sec.getAddress();
67 uint64_t Size = Sec.getSize();
68 Addresses.push_back({O.symbol_end(), Address + Size, 0, Sec});
70 array_pod_sort(Addresses.begin(), Addresses.end(), compareAddress);
72 // Compute the size as the gap to the next symbol
73 for (unsigned I = 0, N = Addresses.size() - 1; I < N; ++I) {
74 auto &P = Addresses[I];
75 if (P.I == O.symbol_end())
78 // If multiple symbol have the same address, give both the same size.
79 unsigned NextI = I + 1;
80 while (NextI < N && Addresses[NextI].Address == P.Address)
83 uint64_t Size = Addresses[NextI].Address - P.Address;
87 // Put back in the original order and copy the result
88 array_pod_sort(Addresses.begin(), Addresses.end(), compareNumber);
89 for (SymEntry &P : Addresses) {
90 if (P.I == O.symbol_end())
92 Ret.push_back({*P.I, P.Address});